295 lines
6.5 KiB
C
295 lines
6.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __LINUX_TPM_EVENTLOG_H__
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#define __LINUX_TPM_EVENTLOG_H__
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#include <linux/tpm.h>
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#define TCG_EVENT_NAME_LEN_MAX 255
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#define MAX_TEXT_EVENT 1000 /* Max event string length */
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#define ACPI_TCPA_SIG "TCPA" /* 0x41504354 /'TCPA' */
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#define EFI_TCG2_EVENT_LOG_FORMAT_TCG_1_2 0x1
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#define EFI_TCG2_EVENT_LOG_FORMAT_TCG_2 0x2
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#ifdef CONFIG_PPC64
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#define do_endian_conversion(x) be32_to_cpu(x)
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#else
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#define do_endian_conversion(x) x
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#endif
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enum bios_platform_class {
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BIOS_CLIENT = 0x00,
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BIOS_SERVER = 0x01,
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};
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struct tcpa_event {
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u32 pcr_index;
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u32 event_type;
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u8 pcr_value[20]; /* SHA1 */
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u32 event_size;
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u8 event_data[];
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};
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enum tcpa_event_types {
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PREBOOT = 0,
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POST_CODE,
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UNUSED,
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NO_ACTION,
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SEPARATOR,
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ACTION,
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EVENT_TAG,
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SCRTM_CONTENTS,
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SCRTM_VERSION,
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CPU_MICROCODE,
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PLATFORM_CONFIG_FLAGS,
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TABLE_OF_DEVICES,
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COMPACT_HASH,
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IPL,
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IPL_PARTITION_DATA,
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NONHOST_CODE,
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NONHOST_CONFIG,
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NONHOST_INFO,
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};
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struct tcpa_pc_event {
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u32 event_id;
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u32 event_size;
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u8 event_data[];
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};
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enum tcpa_pc_event_ids {
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SMBIOS = 1,
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BIS_CERT,
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POST_BIOS_ROM,
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ESCD,
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CMOS,
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NVRAM,
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OPTION_ROM_EXEC,
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OPTION_ROM_CONFIG,
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OPTION_ROM_MICROCODE = 10,
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S_CRTM_VERSION,
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S_CRTM_CONTENTS,
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POST_CONTENTS,
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HOST_TABLE_OF_DEVICES,
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};
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/* http://www.trustedcomputinggroup.org/tcg-efi-protocol-specification/ */
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struct tcg_efi_specid_event_algs {
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u16 alg_id;
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u16 digest_size;
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} __packed;
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#define TCG_SPECID_SIG "Spec ID Event03"
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struct tcg_efi_specid_event_head {
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u8 signature[16];
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u32 platform_class;
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u8 spec_version_minor;
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u8 spec_version_major;
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u8 spec_errata;
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u8 uintnsize;
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u32 num_algs;
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struct tcg_efi_specid_event_algs digest_sizes[];
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} __packed;
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struct tcg_pcr_event {
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u32 pcr_idx;
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u32 event_type;
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u8 digest[20];
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u32 event_size;
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u8 event[];
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} __packed;
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struct tcg_event_field {
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u32 event_size;
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u8 event[];
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} __packed;
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struct tcg_pcr_event2_head {
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u32 pcr_idx;
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u32 event_type;
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u32 count;
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struct tpm_digest digests[];
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} __packed;
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struct tcg_algorithm_size {
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u16 algorithm_id;
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u16 algorithm_size;
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};
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struct tcg_algorithm_info {
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u8 signature[16];
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u32 platform_class;
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u8 spec_version_minor;
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u8 spec_version_major;
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u8 spec_errata;
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u8 uintn_size;
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u32 number_of_algorithms;
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struct tcg_algorithm_size digest_sizes[];
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};
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#ifndef TPM_MEMREMAP
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#define TPM_MEMREMAP(start, size) NULL
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#endif
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#ifndef TPM_MEMUNMAP
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#define TPM_MEMUNMAP(start, size) do{} while(0)
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#endif
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/**
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* __calc_tpm2_event_size - calculate the size of a TPM2 event log entry
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* @event: Pointer to the event whose size should be calculated
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* @event_header: Pointer to the initial event containing the digest lengths
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* @do_mapping: Whether or not the event needs to be mapped
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*
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* The TPM2 event log format can contain multiple digests corresponding to
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* separate PCR banks, and also contains a variable length of the data that
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* was measured. This requires knowledge of how long each digest type is,
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* and this information is contained within the first event in the log.
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*
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* We calculate the length by examining the number of events, and then looking
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* at each event in turn to determine how much space is used for events in
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* total. Once we've done this we know the offset of the data length field,
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* and can calculate the total size of the event.
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*
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* Return: size of the event on success, 0 on failure
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*/
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static __always_inline int __calc_tpm2_event_size(struct tcg_pcr_event2_head *event,
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struct tcg_pcr_event *event_header,
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bool do_mapping)
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{
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struct tcg_efi_specid_event_head *efispecid;
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struct tcg_event_field *event_field;
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void *mapping = NULL;
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int mapping_size;
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void *marker;
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void *marker_start;
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u32 halg_size;
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size_t size;
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u16 halg;
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int i;
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int j;
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u32 count, event_type;
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const u8 zero_digest[sizeof(event_header->digest)] = {0};
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marker = event;
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marker_start = marker;
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marker = marker + sizeof(event->pcr_idx) + sizeof(event->event_type)
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+ sizeof(event->count);
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/* Map the event header */
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if (do_mapping) {
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mapping_size = marker - marker_start;
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mapping = TPM_MEMREMAP((unsigned long)marker_start,
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mapping_size);
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if (!mapping) {
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size = 0;
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goto out;
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}
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} else {
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mapping = marker_start;
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}
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event = (struct tcg_pcr_event2_head *)mapping;
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/*
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* The loop below will unmap these fields if the log is larger than
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* one page, so save them here for reference:
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*/
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count = event->count;
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event_type = event->event_type;
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/* Verify that it's the log header */
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if (event_header->pcr_idx != 0 ||
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event_header->event_type != NO_ACTION ||
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memcmp(event_header->digest, zero_digest, sizeof(zero_digest))) {
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size = 0;
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goto out;
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}
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efispecid = (struct tcg_efi_specid_event_head *)event_header->event;
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/*
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* Perform validation of the event in order to identify malformed
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* events. This function may be asked to parse arbitrary byte sequences
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* immediately following a valid event log. The caller expects this
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* function to recognize that the byte sequence is not a valid event
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* and to return an event size of 0.
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*/
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if (memcmp(efispecid->signature, TCG_SPECID_SIG,
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sizeof(TCG_SPECID_SIG)) ||
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!efispecid->num_algs || count != efispecid->num_algs) {
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size = 0;
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goto out;
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}
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for (i = 0; i < count; i++) {
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halg_size = sizeof(event->digests[i].alg_id);
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/* Map the digest's algorithm identifier */
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if (do_mapping) {
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TPM_MEMUNMAP(mapping, mapping_size);
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mapping_size = halg_size;
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mapping = TPM_MEMREMAP((unsigned long)marker,
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mapping_size);
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if (!mapping) {
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size = 0;
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goto out;
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}
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} else {
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mapping = marker;
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}
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memcpy(&halg, mapping, halg_size);
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marker = marker + halg_size;
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for (j = 0; j < efispecid->num_algs; j++) {
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if (halg == efispecid->digest_sizes[j].alg_id) {
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marker +=
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efispecid->digest_sizes[j].digest_size;
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break;
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}
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}
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/* Algorithm without known length. Such event is unparseable. */
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if (j == efispecid->num_algs) {
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size = 0;
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goto out;
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}
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}
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/*
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* Map the event size - we don't read from the event itself, so
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* we don't need to map it
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*/
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if (do_mapping) {
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TPM_MEMUNMAP(mapping, mapping_size);
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mapping_size += sizeof(event_field->event_size);
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mapping = TPM_MEMREMAP((unsigned long)marker,
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mapping_size);
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if (!mapping) {
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size = 0;
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goto out;
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}
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} else {
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mapping = marker;
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}
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event_field = (struct tcg_event_field *)mapping;
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marker = marker + sizeof(event_field->event_size)
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+ event_field->event_size;
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size = marker - marker_start;
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if (event_type == 0 && event_field->event_size == 0)
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size = 0;
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out:
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if (do_mapping)
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TPM_MEMUNMAP(mapping, mapping_size);
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return size;
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}
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#endif
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